Hill-Sachs type lesion of the femoral head in a case of hip instability.

A Hill-Sachs lesion of the shoulder is an indicator of shoulder instability. Hip instability is also a well-recognized phenomenon. However, no operative or arthroscopic features have previously been reported that support the diagnosis of hip instability. We present a case report of a Hill-Sachs type lesion of the femoral head in a patient with acetabular dysplasia revealed by arthroscopy of the hip. We suggest that finding a Hill-Sachs type lesion of the femoral head may also be regarded as indicative of joint instability, just as it is in the shoulder.